Chapter 828: A troublesome person...
"A Genjutsu cast on himself…" Shikaku muttered. He felt another headache as he thought, 'Akatsuki… Everything about them is troublesome.'
He said, "That sounds like the forbidden Izanagi jutsu of the Uchiha clan?"
Fujin raised an eyebrow and asked, "Izanagi? What does it do?"
Even though Fujin knew very well what that jutsu did, he hadn't encountered any scroll mentioning it. Hence, he could only feign ignorance despite being one of the most knowledgeable about the technique.
Shikaku explained, "It's a very powerful jutsu that the caster casts on himself. It blurs the line between reality and illusion. It's quite complicated and even I don't know how it works, so I'll just explain the effects.
From the moment this jutsu is cast, any damage the Uchiha ninja takes is reversed when the duration of this Genjutsu ends. Even if they die, they'll be back in the same condition they were in at the moment they cast Izanagi. However, it comes at the cost of an eye as they forever lose the eyesight of the eye that casts Izanagi."
Surprise appeared on Fujin's face as he muttered, "That's an incredible jutsu… Even though the cost is high, losing an eye is better than losing their life. Is there any way to counter it?"
Shikaku answered, "There is one jutsu which is called Izanami. It was created to counter Izanagi. Unfortunately, it was created by none other than the Uchiha clan and needs a Sharingan to cast. And, it also costs the eye. So, only Kakashi could use it, if we knew how to use it.
So, the only available option is to kill them twice or thrice depending on how much they're willing to sacrifice. The only good thing is that they'll be much weaker once they lose both eyes, especially if it's the Mangekyou Sharingan. Did he have a Sharingan in the other eye?"